I preordered Eberron from amazon.com many weeks ago, and it arrived last Tuesday. I'd intended to mine it for ideas and use it as a design reference, but it's such a gorgeous book and so well done that it's really making a good case for being the next campaign setting I run, after my current Age of Mortals Dragonlance campaign winds up.
It really is one of those books which makes me say, "Bastards!" when I read it. Not just because it's full of ideas, concepts, and elements that I really like (action points, pulp action, recovering from long conflict, etc) but it has so much in common with a setting I'd been csaually putting together since the Setting Search was over that I'm now more or less forced to abandon that completely (down to the living constructs and diplomatic gnomes).
My players will decide, though. I didn't give them a choice when we ended my Elizabeth Willey-inspired Birthright campaign and started playtesting the Key of Destiny, so this time they're calling the shots. Of course, half of them have already had a look through the Eberron campaign setting book and are talking about it in expectant tones...
Cheers,
Cam